Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Add tacker support in compass4nfv for Fraser

    JIRA: COMPASS-577

    1. Add tacker service into haproxy configuration file
    2. Include tacker installation into setup-openstack.yml

    Change-Id: I5a91766e034ec55af711029aac4ba9ed4a388db2
    Signed-off-by: Yifei Xue <xueyifei@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index 7dfbe30..e7f4a73 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit 7dfbe30d59e513da56fe34e3ffa44840a4c41ded
+Subproject commit e7f4a7321e549f88c461714dc0c9f24f925928e3